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Physics

Physics
Light travels slowest in

Vacuum
Water
Glass
Air

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Physics
In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to

1 N
10 N
0.1 N
100 N

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Physics
Sun appears red in colour at sunrise and sunset due to

That all other colours scatter away except red
That sun comes out of the mountains
The fact that sun emits only red colour at that time
Red light having longer wave length scatters away

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Physics
Blotting paper absorbs ink due to

Viscosity of ink
Siphon action
Diffusion of ink through the blotting
Capillary action phenomenon

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Physics
A copper disc has a hole. If the disc is heated, the size of the hole

Increases
First increases and than decreases
Decreases
No change

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Physics
Shock-absorbers are usually made of steel as it :

Is not brittle
Has lower elasticity
Has no ductile property
Has higher elasticity

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